Biology High School

Which statement helps to explain why ice is less dense than liquid water?
-Water molecules make hydrogen bonds at definite angles.
-Cold molecules move less than warm molecules.

Answers

Answer 1

The reasons why ice is less dense than liquid water are supported by both of the above.

1. At specific angles, water molecules form hydrogen bonds.

2. Cold molecules are less mobile than warm ones.

Statement:

Warm water contains greater energy, which causes the molecules to move more swiftly than those in cold water.

Hydrogen bonds increase as water freezes, creating more space between molecules and lowering overall density. Each water ice molecule forms hydrogen bonds with four additional molecules, compared to just 3.4 for water molecules on average.

When water transforms from a liquid to a solid, the molecules organize themselves into a more structured and void-filled crystalline lattice.

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Related Questions

Choose your favorite food. Describe its pathway through the digestive system. Make sure you include in your description the following terms: teeth, salivary gland, bolus, amylase, pepsin, small intestine, villi, stomach, chime, large intestine, esophagus, liver, and pancreas

Answers

When we eat pizza, the first step in digestion is the physical breakdown of the food in the mouth. The teeth grind the pizza into smaller pieces, forming a bolus. As the bolus is being chewed, the salivary gland secretes amylase, which starts breaking down the carbohydrates in the pizza into simpler sugars.

The bolus of partially digested pizza then travels down the esophagus and into the stomach, where it is mixed with gastric juices that contain pepsin, an enzyme that helps break down proteins. The mixture of partially digested pizza and gastric juices is called chime.

The chime then moves from the stomach into the small intestine, where it is further broken down by enzymes from the liver and pancreas. The small intestine is lined with tiny finger-like projections called villi, which absorb the broken-down nutrients and pass them into the bloodstream.

Finally, the remnants of the digested pizza move into the large intestine, where water and electrolytes are absorbed, and the remaining material is eliminated as feces.

In this way, the pizza is broken down and its nutrients are absorbed and utilized by the body as it travels through the digestive system
favorite food is pizza through that

13. How did Kettlewell test his hypothesis?
HELP I HAVE TO TURN THIS IN NEXT PERIOD

Answers

Kettlewell conducted an in-depth investigation of bird predation on moths to verify his theory regarding the evolutionary basis of industrial melanism.

When he carried out this investigation, Kettlewell tested what exactly?

Kettlewell came to the conclusion that industrial melanism, which darkened the hue of the trees, was brought on by pollution from the companies in Birmingham. As a result, the moths with the recessive features had a higher likelihood of surviving due to the concealment.

The goal of Kettlewell's experiment was to determine whether a single instance of natural selection could be explained in terms of a particular process or agent, in this case, bird predation. Biologists would not have abandoned the theory of natural selection if it had failed. Most biology textbooks include Kettlewell's experiment as an illustration of how evolution works.

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Have An Amino Group And A _____________ Group Attached To The Central _______________. There AreFor each of the following sentences, fill in the blanks with the best word or phrase selected from the list below. Not all words or phrases will be used; each word or phrase should be used only once. Proteins are ______________ built from amino acids, which each have an amino group and a _____________ group attached to the central _______________. There are twenty possible _______________ that differ in structure and are generally referred to as "R." In solutions of neutral pH, amino acids are _______________, carrying both a positive and negative charge. When a protein is made, amino acids are linked together through _______________, which are formed by condensation reactions between the carboxyl end of the last amino acid and the ___________________ end of the next amino acid to be added to the growing chain.a: amino b: ionized c: polypeptidesd: alpha-carbon e: length f: proteing: carbon h: noncovalent i: R groupj: carboxyl k: peptide bonds l: side chainsm: hydroxide

Answers

Amino acids, which each have an amino group and a carboxyl group connected to the core alpha-carbon, are the building blocks of proteins.

Have An Amino Group And A Carboxyl Group Attached To The Central Alpha-carbon. There Are Twenty Possible R Groups That Differ In Structure And Are Generally Referred To As "R." In Solutions Of Neutral pH, Amino Acids Are Ionized, Carrying Both A Positive And Negative Charge. When A Protein Is Made, Amino Acids Are Linked Together Through Peptide Bonds, Which Are Formed By Condensation Reactions Between The Carboxyl End Of The Last Amino Acid And The Amino End Of The Next Amino Acid To Be Added To The Growing Chain.

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a neuron that has responded to a stimulus causes decreased activity in neighboring neurons in which process?

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lateral inhibition

Lateral inhibition is the process by which stimulated neurons inhibit the activity of nearby neurons. In lateral inhibition, neural signals to neighboring neurons are minimized. Lateral inhibition allows the brain to manage environmental input and avoid information overload.

The firing neurons inhibit stimulation around them. Therefore, only neurons are most stimulated and least inhibited in response. Lateral inhibition plays an important role in visual perception by increasing contrast and resolution of visual stimuli. This happens at various levels of the visual system. Lateral inhibition occurs in sensory systems of the body including olfactory, visual, tactile, and auditory systems.

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1) Explain the changes in heart rate between conditions. Describe the physiological mechanisms causing these changes

Answers

The autonomic (involuntary) nerve system's two branches regulate heart rate. SNS and PNS, are sometimes known as the parasympathetic and sympathetic nervous systems (PNS).

To increase heart rate, the sympathetic nervous system (SNS) produces the catecholamines epinephrine and norepinephrine. The hormone acetylcholine is released by the parasympathetic nervous system (PNS) to reduce the heart rate.

Higher heart rates could be a sign of poor heart health and the extra strain of been put on the heart's ability to pump blood. This may also point to issues related to cardiac disease.

The capacity of the heart to contract and how long it takes for the heart to fill with blood. The parasympathetic neural system becomes more active, and possibly the sympathetic nervous system becomes less active, which lowers the heart rate.

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What is the proper way of transferring the inoculum into the tube?

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The proper way of transferring the inoculum into the tube is by sterilization the inoculum.

Sterilization helps  insure that no  pollutants are transferred with the sample. Next, use a sterile pipette or hype to transfer the inoculum. Make sure that the pipette or hype tip is also sterile. Take care to avoid contact with the innards of the tube. When transferring the inoculum,  insure that it's unevenly distributed throughout the tube.

To do this,  sluggishly draw the inoculum up and down within the tube several times. Eventually, cover the tube with a sterile lid or cap, and store the inoculum according to the specific  requirements of the sample. This process should be carried out in a sterile utensil  similar as a laminar inflow hood, to help  help  impurity.

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Each amino acid is coded for by several different codons. How might this offset transcription or translation errors?

Answers

Errors may occur during transcription or translation, but since there are numerous alternative codons used to code amino acids, the error would be compensated for.

Because there are many codons present, even if an incorrect match or pairing of the letters occurs, another type of codon having those letters would be there, which results in not being an issue or becoming a harmful form of mutation, this would counteract the transcription and translation faults. In essence, it would reduce the likelihood that a transcription or translation process would result in the formation of an incorrect kind of protein.

A codon is an array of three nucleotides in RNA or DNA that corresponds to a certain kind of amino acid or stop signal. While errors could happen during transcription or translation, the fact that each amino acid is coded by a variety of distinct codons can prevent them.

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